Furnace-cover attachment.



11. 11. STEELE. FURNAGE COVER ATTACHMENT.

APPLICATION FILED JULY 11, 1910.

1,004,925. Patented 0111.3, 1911.

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D. R. STEELE.

FURNACE COVER ATTACHMENT.

APPLICATION FILED JULY 11, 1910.

- 1,004,925, PatentedCct. 3, 1911.

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UNITED STATES PATENT OFFTQE.

DAVID.-

STEELE, OF CURTIS BAY, MARYLAND, ASSTGNOR 0F ONE-HALF TO HARRY D.

HARVEY, OF BALTIMORE, MARYLAND.

FURNACE-COVER ATTACHMENT.

Specification of Letters Patent.

Patented Diet. 3, 1911.

To. all whom it; may concern:

Be it known that I, DAVID R. STEELE, a citizen of the United States,residing at Curtis Bay, in the county of Anne Arundel and State ofMaryland, have invented certain new and useful Improvements inFurnace-Cover Attachments, of which the following is a specification.

This invention comprises means for removing and replacing the covers offurnaces for melting metals, whereby the cover, when removed from thefurnace, is automatically turned so that its lower side will face awayfrom the top of the furnace, thus permitting the workmen to remove thecrucible containing the molten metal without being exposed to the heatradiating from the side of the cover which has been subjected to theintense heat of the furnace.

In the accompanying drawing, Figure 1 is a perspective view, taken fromthe fuelinlet side, of a furnace with my improvements thereon, the coverbeing shown in closed position; Fig. 2 is a similar view of the upperportion of the furnace taken from the outlet side, and Fig. 3 is a Viewsimilar to that shown in Fig. 1 but showing the cover removed from thefurnace top.

Referring to the drawing, A indicates a furnace casing adapted toreceive a crucible which may be inserted and removed through the openend a of the casing. The furnace is provided at one side with thenecessary fuel feeding device B, and at its opposite side with asuitable duct C for the escape of the burned gases.

Upon brackets 1, arranged at either side of the outlet duct, are securedbearings 2 in which is journaled a rock shaft 3, and upon the ends ofthe shaft are secured arms 4 and 5, the shaft and arms forming a yokefor raising and lowering the cover D of the furnace. The cover is madeof refactory material surrounded by a metal band 6, and it is pivotallyconnected at its periphery to the free ends of the arms 4, 5, bytrunnions 7 which are arranged slightly at one side of a line passingdiametrically through the cover so that the cover is unbalanced, thepart 03 at one side of the line of the trunnions being somewhat heavierthan the part 03 at the opposite side of said line.

A crank arm 8, secured rigidly to one of the trunnions, projects towardthe inlet side of the furnace, and, at the opposite side of the axis ofthe cover, the latter is provided with a laterally projecting tongue orstop 9, which rests upon one of the arms 4 of the yoke when the cover isin position over the open end a of the furnace. The crank arm isconnected by a link 10 to a stationary stop 11, secured upon the side ofthe furnace wall below the pivotal axis of the cover, when the latter isupon the furnace. The link 10 extends through a suitable guideway oropening in the stop 11, and a collar 12, which forms a stop, is securedto the link below the stop 11.

A short lever 13 is secured to the rock shaft 3, and in order to rockthe shaft a long lever 14: is provided, the latter having a socket inone end which fits over the short lever 13.

When the cover is upon the furnace, the stop 12 is a short distancebelow the stop 11 and the stop 9 rests upon the arm 4 of the yoke, asshown in Fig. 1. To remove the cover from the top of the furnace, thelever v1 1 is placed upon the short lever 13 and swung so as to rock thearms 1 and 5 of the yoke from the position shown in Figs. 1 and 2 to theposition shown in Fig. 3. During the first part of this movement thecover is lifted without turning on its trunnions, the heavier part ofthe cover being supported by the projection 9 resting upon the arm 4.After the lid has been thus lifted away from the furnace wall, thecontinued rotation of the yoke causes the stop 12 on the link or stay 10to engage the stop 11 and then, as the arms 1 and 5 swing to their finalposition, the crank 8, connected to the link 10, causes the cover toturn approximately one hundred and eighty degrees about its own pivotalaxis, reversing its position relatively to the yoke, so that the lowerside of the cover will face away from a vertical line passing throughthe mouth of the furnace. The arms of the yoke swing slightly past thevertical position and the stay 10 prevents further movement and holdsthe parts in the position shown in Fig. 3. The workmen may then inspector remove or replace the contents of the furnace without being aflectedby the heat radiating from the lower face of the cover.

To return the cover to its position over the open end of the furnace,the lever 14 is moved in the opposite direction and as the yoke armsswing toward the horizontal position the cover turns about its axisuntil the stop 9 rests upon the arm 4, and finally the parts assume thepositions shown in Figs. 1 and 2.

While the invention is particularly desirable for furnaces it may beapplied to other receptacles.

What I claim is 1. The combination with a receptacle having an opening,and a cover for said opening, of means for raising and lowering thecover and swinging the same to one side of the opening, and means forautomatically turning said cover so that its lower side will face awayfrom a vertical line passing through the opening when raised.

2. The combination with a receptacle having an opening and a cover forsaid opening, of means for raising and lowering the cover and swingingthe same to one side of the opening, and means for automatically turningsaid cover, while being raised, so that its lower side will face awayfrom a Vertical line passing through the opening, and for returning saidcover, while being lowered, so that its lower side will face and extendover the opening.

3. The combination with a receptacle, having an opening, of a yokehinged at one side of the opening, a cover pivotally mounted in the armsof said yoke, means for rocking the yoke to raise and lower the coverand means for automatically turning the cover about its pivotal axis sothat its lower side will face away from a vertical line passing throughthe opening when the cover is raised and said lower side will face theopening when the cover is lowered.

4. The combination with a receptacle, having an opening, of a yokehinged'at one side of the opening, a cover pivotally mounted in the armsof said yoke, means for rocking the yoke to raise and lower the coverand means for automatically turning the cover approximately one hundredand eighty degrees about its pivotal axis, and wlth its lower sidefacing away from the opening, when the yoke is raised.

5. The combination with a receptacle, having an opening, of a yokehinged at one side of the opening, a cover pivotally mounted in the armsof said yoke, means for rocking the yoke to raise and lower the Copiesof this patent may be obtained for five cents each, by addressing theCommissioner of Patents,

cover and means for automatically turning the cover about its pivotalaxis when the yoke is operated, comprising a crank arm connected to thecover, a stationary stop, and a stay forming a lost motion connectionbetween said crank arm and stop.

6. The combination with a receptacle, having an opening, of a yokehinged at one side of the opening, a cover pivotally mounted in the armsof said yoke, means for rocking the yoke to raise and lower the coverand means for automatically turning the cover about its pivotal axiswhen the yoke is operated, comprising a crank-arm connected to thecover, a stationary stop having a guide-opening, a stay-rod connected tosaid crank arm and extending through said opening, and a stop upon saidrod adapted to engage the stationary stop when the cover is raised.

7. The combination with a receptacle having an opening, of a yoke hingedat one side of the opening, a cover pivoted at its edges between thearms of said yoke, means for rocking the yoke to raise and lower thecover, a stop upon the cover at one side of its axis adapted to restupon the yoke when the yoke is lowered, an arm secured to the cover andextending at the opposite side of its axis, a stationary stop, and astay forming a lost-motion connection between said latter arm and saidstop.

8. The combination with a receptacle having an opening, of a yoke hingedat one side of the opening, a cover pivoted at its edges between thearms of said yoke, means for rocking the yoke to raise and lower thecover, a stop upon the cover at one side of its axis adapted to restupon the yoke when the yoke is lowered, an arm secured to the cover andextending at the opposite side of its axis, a stationary stop arrangedbelow the pivotal axis of the cover, said stop having a guide way, astay rod connected to said latter arm and extending through saidguideway, and a stop fixed to said rod below said stationary stop.

In testimony whereof I aifix my signature, in presence of two witnesses.

DAVID R. STEELE.

l/Vitnesses:

ROBERT WATSON, C. ROLLINS ROGERS.

Washington, D. G.

